A 25-Year-Old Woman with a High-Risk Large and Occlusive Pulmonary Embolism, Later Diagnosed with Primary Antiphospholipid Syndrome and Hyperhomocysteinemia: A Case Report.

BACKGROUND High-risk pulmonary embolism (PE) occurs when the pulmonary circulation is suddenly occluded by a thrombus and is a life-threatening medical emergency. In young and otherwise healthy individuals, there may be undiagnosed underlying risk factors for PE that require investigation. This report presents the case of a 25-year-old woman admitted as an emergency with a high-risk large and occlusive PE, later diagnosed with primary antiphospholipid syndrome (APS) and hyperhomocysteinemia.